Figure 5. CV of alizarin (DRP 110ALI unmodified) and MWCNT-SPE with alizarin / Nafion modified with Nafion). Dotted line: Sampling rate 0.02 V/s, unmodified DRP 110ALI-SPE. Black solid line: Scan rate 0.02 V/s, MWCNT/alizarin/Nafion-SPE. Dashed line: scan rate 0.2 V/s MWCNT/alizarin/Nafion-SPE (see the different current scales). Numbers refer to the above reaction scheme. The star symbolizes the reaction product of the dicarbonyl, see reaction (2). Wide arrow: scan direction

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Monitoring pH Using Alizarin-modified Commercial Screen-printed Electrodes

Achim Habekost

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